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Sentry

//ˈsɛn.tɹi// noun

Definitions

Noun
  1. 1
    A guard, particularly on duty at the entrance to a military base.

    "Additional sentries are keeping watch for any signs of an ambush."

  2. 2
    a person employed to keep watch for some anticipated event wordnet
  3. 3
    Sentry duty; time spent being a sentry. uncountable
  4. 4
    A form of drag to be towed underwater, which on striking bottom is upset and rises to the surface.
  5. 5
    A watchtower.
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  1. 6
    An animal like a marmot tasked with alerting the pack to danger.

Etymology

From earlier sentrie, sentery, of uncertain origin. Perhaps an alteration of sentinel or sanctuary; or perhaps from Old French senteret (“a path”), diminutive of sentier, from Medieval Latin semitarius (“a path”).

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